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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edc8ff180bc4126fec35169b84166c1adbc404d92af1912e3b0c52077610619' 
  AND token = 'yyUNltt3nfOKqxtnhsqYRyTQ9P82AVEDgiroz/K5iBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}